Calculate the ΔH for the following reaction: 2 P + 5 Cl2 → 2 PCL5
Given the following information:
PCL5 → PCl3 + Cl2
P + 3/2 Cl2 → PCl3
ΔH = +87.9 kJ
ΔH = - 574 kJ
PI

Chen drew a diagram to compare the ways in which different organisms obtain nitrogen. which label belongs to the area marked z?

Skills of homo sapiens were found an excavation. the skulls were preserved because the bodies were frozen. so, these fossils are (blank) fossils. the image shows the evolution of skulls beginning 2 to 3 million years ago. based on the image, modern human skulls(blank) ape skulls.

How can the periodic table be used to predict the behavior of elements?